Conductive member

ABSTRACT

Connection reliability is increased when making an electrical connection. A conductive member is formed using a pipe member made of a conductive metal. The conductive member has a conductive body portion that extends in the lengthwise direction and that forms an electrical conduction path, and an insulating layer formed on the outer circumferential surface. Also, a terminal portion that enables connection with a partner member is integrally formed in each of the two end portions of the conductive body portion. The terminal portions are formed so as to be flat and are provided with a connection hole  12  so as to enable connection with an electrode of an auxiliary battery or a terminal of a DC/DC converter.

TECHNICAL FIELD

The present disclosure relates to a conductive member.

BACKGROUND ART

The supply of electricity to (e.g., the charging of) a 12 V battery(auxiliary battery) installed in a hybrid vehicle, for example, has beencontrolled by lowering the voltage of high-voltage electricity from themain battery for motor driving using a DC/DC converter, and thensupplying the reduced-voltage electricity from the main battery to theauxiliary battery.

JP 2006-174619A is an example of related art.

Conventionally, the auxiliary battery and the DC/DC converter have beenconnected to each other by an electrical wire with terminals attached atthe two ends. When making a connection using such an electrical wireprovided with terminals, the connection locations include not only theconnections with the battery and the converter, but also the connectionsbetween the electrical wire and the terminals, thus raising the numberof factors that reduce connection reliability.

There are also cases where the DC/DC converter is installed in the rearside of the vehicle, and the auxiliary battery is installed in theengine room. In these cases, it is common for the electrical wireconnecting the two to be laid under the floor of the vehicle, and theelectrical wire needs to be passed through a protector in order to beheld in a predetermined route (route restriction). However, taking thissort of measure requires members such as a protector and holding clampsfor holding the protector to the vehicle body, and thus has the risk ofleading to a reduction in work efficiency and an increase in cost.

SUMMARY OF THE INVENTION

An object, for example, of the present disclosure is to provide aconductive member that is superior in terms of contact reliability andthat can inexpensively realize route restriction with an improvement inwork efficiency.

A first aspect of a conductive member according to exemplary embodimentsis a conductive member formed using a pipe member made of a conductivemetal, the conductive member includes: a conductive body portion thatextends in a lengthwise direction and that forms an electricalconduction path; and a terminal portion that is integrally formed in atleast one end portion of the conductive body portion and that enablesconnection with a partner member.

Conventionally, terminal fittings are connected to the ends of anelectrical wire. In contrast, according to exemplary embodiments, it ispossible to reduce the number of connection locations by forming theconductive body portion, corresponding to the electrical wire, and theterminal portions, corresponding to the terminal fittings, in anintegrated manner. This makes it possible to increase connectionreliability.

Also, because the conductive member, according to exemplary embodiments,has a predetermined three-dimensional shape, the conductive member canhold a predetermined bent shape on its own. Thus, the conductive memberdoes not require the use of a protector, clamps, or he like, as iscommonly required in conventional technology, in order to hold thepredetermined three-dimensional bent shape. The embodiments of thepresent disclosure can therefore inexpensively realize routerestriction, and can improve work efficiency as well.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing a system for supplying electricity toan auxiliary battery according to an exemplary embodiment;

FIG. 2 is a perspective view of connections between an auxiliary batteryand a DC/DC converter according to an exemplary embodiment;

FIG. 3 is a cross-sectional view of a conductive body portion of aconductive member according to an exemplary embodiment;

FIG. 4 is a cross-sectional view of a terminal portion of the conductivemember according to an exemplary embodiment; and

FIG. 5 is a cross-sectional view of a collapsed area of a conductivebody portion according to an exemplary embodiment.

EMBODIMENTS OF THE INVENTION

The following describes exemplary embodiments. Other embodiments will beapparent to those skilled in the art from consideration of thedisclosure.

(1) In exemplary embodiments, the conductive member is configured suchthat an insulating layer is formed on an outer circumferential surfaceof the conductive body portion.

According to this configuration, the insulation of the conductive memberis ensured by the insulating layer.

(2) Also, in exemplary embodiments, the conductive member is configuredsuch that the terminal portion includes flat portions, formed bycollapsing two end portions of the pipe member, and connection portions,which are formed in the flat portions and enable connection with thepartner member.

According to this configuration, the flat portion of the terminalportion is formed by collapsing the pipe member, thus facilitating closecontact when the connection location on the partner member is flat. Thismakes it possible to increase connection reliability.

(3) Furthermore, a collapsed area may be formed in the conductive bodyportion by collapsing a predetermined range in the lengthwise directionof the conductive body portion.

According to this configuration, the conductive body portion has acollapsed area over a predetermined length range, thus making itpossible to arrange a conductive member that reduces space in thecollapsing direction.

FIG. 1 is a schematic block diagram of a system for supplyingelectricity to an auxiliary battery (12 V battery) for installation in ahybrid vehicle, according to exemplary embodiments. The system forsupplying electricity to an auxiliary battery 4 is configured to includea main battery 1, a DC/DC converter 2, an electricity supply controlcircuit 3, and the auxiliary battery 4.

As shown in FIG. 1, based on an instruction from the electricity supplycontrol circuit 3 and when the vehicle is in a battery travel mode, themain battery 1 supplies electricity having a high battery voltage, forexample voltage of about 200 V, to the DC/DC converter 2, and suppliesdriving electricity to a traveling motor (not shown) via an inverter(not shown). The electricity supply control circuit 3 detects thebattery voltage and the battery temperature of the main battery 1,detects the battery voltage of the auxiliary battery 4, and controlsoperation of the DC/DC converter 2 and the like based on the detecteddata and the like.

The auxiliary battery 4 is a 12 V battery, for example, and supplieselectricity to various types of low-voltage loads 5 (e.g., a navigationapparatus, an air conditioner, and/or headlights) provided in thevehicle.

FIG. 2 shows connections between the DC/DC converter 2 and the auxiliarybattery 4. Multiple terminals 2A (only two are shown in FIG. 2) protrudefrom the DC/DC converter 2. A circular junction hole 2B is formed as athrough-hole in each of the terminals 2A. A pair of electrodes 4A (apositive electrode and a negative electrode), which are formed with anapproximately columnar shape, protrude from the upper surface of theauxiliary battery 4. The terminals 2A and the electrodes 4A areconnected to each other by two conductive members 6.

Each of the conductive members 6 is made of a conductive metal, and isformed as a single body using a pipe member that has a circularcross-section. The conductive member 6 includes terminal portions 7provided at its two ends, and a conductive body portion 8 formed betweenthe two terminal portions 7. As shown in FIG. 3, the conductive bodyportion 8 is formed so as to have a circular cross-section overapproximately the entire length thereof. Additionally, the conductivebody portion 8 includes a conductive layer 10 and an insulating layer 9.The insulating layer 9 is made of a synthetic resin and is formed on anouter circumferential surface of the conductive layer 10. As shown inFIG. 2, intermediate portions of the conductive body portion 8 are bent,and the conductive body portion 8 holds a predetermined bent shape. Thispreformed bending is achieved using a bending device that does notcollapse the bent portions.

As shown in FIG. 4, each of the two terminal portions 7 is formed bycollapsing an upper surface side of the circular pipe member until itcomes into close contact with a lower surface side of the pipe member.Accordingly, each of the two terminal portions 7 is provided with a flatportion 11 that has been collapsed into a flat shape according to whichthe lower surface of the terminal portion 7 is substantially flush withthe lower surface of the conductive body portion 8. Also, a connectionhole 12, which serves as a connection portion, is formed as athrough-hole in the flat portion 11 of each of the two terminal portions7. The connection holes 12 can be substantially aligned with and put incommunication with the junction holes 2B in the terminals 2A of theDC/DC converter 2. Additionally, the connections holes 12 are formedsuch that the electrodes 4A of the auxiliary battery 4 can be insertedtherein.

Note that in exemplary embodiments, the connection holes 12 are eachshaped as an elongated hole that extends in a direction perpendicularthe lengthwise direction of the conductive member 6. As shown in FIG. 4,the insulating layer 9 is removed from the terminal portions 7, and theconductive layer 10 is exposed over the entire surface of the terminalportions 7.

The following describes advantages and effects of the exemplaryembodiments. The auxiliary battery 4 and the DC/DC converter 2 areconnected by the conductive members 6 in the following manner.

Specifically, the connection hole 12 of one of the terminal portions 7of one of the two conductive members 6 is fitted around one of theelectrodes 4A of the auxiliary battery 4 and fastened thereto using anut 13. The other terminal portion 7 of the conductive member 6 isplaced over the corresponding terminal 2A of the DC/DC converter 2, andthe connection hole 12 and the junction hole 2B are aligned with eachother. Even if there is a certain amount of misalignment in thelengthwise direction of the conductive member 6 at this time, theconnection hole 12 and the junction hole 2B can be aligned with eachother because the connection hole 12 is an elongated hole andeffectively absorbs the misalignment. A bolt 14 is inserted through thejunction hole 2B and the connection hole 12 in the aligned state andfastened from the opposite side using a nut 15, thus connecting theterminal portion 7 and the terminal 2A. The other conductive member 6 isthen also connected to the auxiliary battery 4 and the DC/DC converter2, thus completing the task of connecting the auxiliary battery 4 andthe DC/DC converter 2.

The following describes advantages and effects of the exemplaryembodiments. Since the conductive body portion 8 and the terminalportion 7 of the conductive member 6 are formed in an integrated manner,the number of connection locations can be reduced compared toconventional modes, in which terminals are connected to an electricalwire. Thus, it is possible to increase connection reliability, comparedto the conventional modes. Also, because the conductive member 6 isformed using a pipe member, it can be bent into a predetermined layoutshape in advance and can hold that shape. The task of arrangingelectrical wires can therefore be performed easily. Also, becauseconductive member 6 is formed using a pipe member, it is possible toobtain a higher shape holding ability, compared to conventional membersthat are formed using a plate material. Accordingly, there is no need toform the conductive member 6 with reinforcing structures such as ribs,which are required when the member is formed of a plate material.

Electrical wires themselves are flexible, and therefore they cannot holda predetermined layout shape on their own. It is thus laborious toinsert electrical wires through a protector (exterior member) such as acorrugated tube, and many holding clamps are needed to fix the protectorto the vehicle body. In this respect, the conductive member 6, accordingto exemplary embodiments, can hold its formed shape on its own, and thusthe exterior member can be omitted. Additionally, the number of membersneeded for holding the conductive member 6 can be reduced, thus makingit possible to improve work efficiency and reduce cost.

Furthermore, since the insulating layer 9 is formed on the outercircumferential surface of the conductive body portion 8 of theconductive member 6, there is no risk of a short. This insulating layer9 can be easily formed by performing, coating, or molding.

Moreover, positional misalignment of the conductive body portion 8during connection to the DC/DC converter 2 or the auxiliary battery 4can be effectively absorbed by forming the connection hole 12 as anelongated hole.

Although in the above described exemplary embodiments the conductivemember 6 connects the auxiliary battery 4 and the DC/DC converter 2, theconductive member 6 may connect the main battery 1 and an inverter, forexample. Conventionally, the main battery 1 and the inverter in a hybridvehicle are connected via a long routing pathway that extends under thefloor from the rear side of the vehicle to the interior of the engineroom. It has been known that a sufficient amount of space in the heightdirection cannot be ensured for the conventional routing pathway. In thecase of applying the conductive member 6, according to exemplaryembodiments, to this routing pathway, a predetermined length range ofthe conductive body portion 8 is collapsed in the height direction (theup-down direction in FIG. 5) to form a collapsed area. Thus, thecollapsed are reduces the height needed for the installation space ofthe conductive member 6.

The present invention is not limited to the embodiments described abovewith reference to the drawings, and embodiments such as the followingexamples are also encompassed in the technical scope of the presentdisclosure.

(1) Although the conductive member 6 of the above exemplary embodimentsis formed using a circular pipe, it may be obtained by processing asquare pipe.

(2) Although the above exemplary embodiments describe a mode ofconnection by forming the connection hole 12 as a through-hole servingas the connection portion, a mode is possible in which the connectionhole 12 is not formed, and connection with the partner member isperformed using the original tab shape.

(3) Although the terminal portions 7 at the two ends of the conductivemember 6 have the same shape in the above exemplary embodiments, theymay have different shapes according to the mode of the connectionpartner.

LIST OF REFERENCE NUMERALS

2 DC/DC converter

4 Auxiliary battery

6 Conductive member

7 Terminal portion

8 Conductive body portion

9 Insulating layer

11 Flat portion

12 Connection hole (connection portion)

What is claimed is:
 1. A conductive member formed using a pipe membermade of a conductive metal, the conductive member comprising: aconductive body portion that extends in a lengthwise direction and thatforms an electrical conduction path; and a terminal portion that isintegrally formed in at least one end portion of the conductive bodyportion and that enables connection with a partner member.
 2. Theconductive member according to claim 1, wherein an insulating layer isformed on an outer circumferential surface of the conductive bodyportion.
 3. The conductive member according to claim 1, wherein theterminal portion includes: flat portions formed by collapsing two endportions of the pipe member, and connection portions that are formed inthe flat portions and that enable connection with the partner member. 4.The conductive member according to claim 1, wherein a collapsed area isformed in the conductive body portion by collapsing the conductive bodyportion a predetermined range in a lengthwise direction.